ref: f6d97317c22b5d2e703844728a3f41b6bc3a74a4
dir: /h/spa.h/
typedef struct {
SPFLOAT *buf;
uint32_t pos;
uint32_t bufsize;
sp_audio spa;
} sp_spa;
int sp_spa_create(sp_spa **p);
int sp_spa_destroy(sp_spa **p);
int sp_spa_init(sp_data *sp, sp_spa *p, const char *filename);
int sp_spa_compute(sp_data *sp, sp_spa *p, SPFLOAT *in, SPFLOAT *out);